Direct-Fit Front Catalytic Converter For 2012-2015 Buick Lacrosse Regal Verano 2.4L Chevy Impala 2.4L

Three-way catalysis refers to the catalysis of harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. The main component is a three-way catalytic converter, which is a piece of porous ceramic material that is installed in a special exhaust pipe. It is called a carrier because it does not participate in the catalytic reaction itself, but is covered with a layer of precious metals such as platinum, rhodium, palladium, and rare earth coatings. It is the most important external purification device installed in the exhaust system of automobiles.